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I sounds like it's supposed to be personally your story. Therefore, can think of a moment in your own life. It doesn't have to be something that is mind blowing like overcoming cancer or something (of course if you did that might be a great story). But rather just a moment that you look back on an think, I might have been a different person today if I didn't. It could be something so simple as learning to ride your bike. Or maybe a moment you first began sports or something.
I hope this helps. If you need a story that is not your own, maybe as a parent or a sibling, even a friend.
I also think it will be difficult for you to get a personal story from someone on here because it is too personal of a thing to tell on the internet without knowing the person personally.